Not accurate, both leak very frequently.
Leaked prior to launch - Leaked Benchmarks Confirm M2 Chip is Up to 20% Faster Than M1 https://www.macrumors.com/2022/06/15/m2-geekbench-benchmark/
Leaked prior to announcement - 'M2 Max' Geekbench Scores Leak Online, Revealing Rumored Specs and Performance
https://www.macrumors.com/2022/11/30/m2-max-chip-geekbench-r...
Leaked prior to launch - M3 Max Chip Around as Fast as M2 Ultra in Early Benchmark Results
https://www.macrumors.com/2023/11/01/m3-max-chip-benchmark-r...
Leaked prior to announcement - Mac M4 Chip Performance Unveiled in First Benchmarks
https://www.macrumors.com/2024/10/07/m4-mac-chip-benchmarks/
Leaked prior to launch - M5 Chip Achieves Impressive Feat in 14-Inch MacBook Pro Speed Test https://www.macrumors.com/2025/10/17/m5-chip-macbook-pro-gee...
Leaked prior to launch - Apple's M5 Max Chip Achieves a New Record in First Benchmark Result
https://www.macrumors.com/2026/03/05/m5-max-geekbench-benchm...
Then add this one to the list.